Hello to the group;
First, thanks to the many folks that took the time to answer my inquiry.
Your responses are greatly appreciated.
Second, I removed one of the tubes, powered on the amp and the behavior
seen before was gone. I found and installed a spare and now the amp is back
to normal ops.
The faulty tube is 6 years old. I dont know what the normal life-span is
for a 3-500z but I had hoped for a few more years.
73 to all
Steve AA7V
On Mon, Oct 5, 2020 at 11:03 AM Steve AA7V <aa7victor@gmail.com> wrote:
Hello to the group;
My SB220 has started to act up.
Immediately upon power on, the 3-500s both start drawing plate current.
The meter shows approximately 250 ma of current. It is apparent some
component has failed.
Also, it appears the grid current meter is showing a negative value (if
this is possible) as the needle now rests on the left peg.
I am not adverse to troubleshooting to the component level but would
appreciate any advice as to how to narrow my search to a specific set of
probable causes.
If I am unable to fix this amp, does anyone have any recommendations
towards a person that works on SB220s?
Regards
Steve AA7V
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